Abstract 3322: Chronic Vascular Responses To Sirolimus-eluting Stent Compared With Bare-metal Stent In Diabetic Patients: Evaluated By Optical Coherence Tomography.
OBJECTIVE: An optical coherence tomography (OCT) study was performed to compre the vascular response to sirolimus-eluting stent (SES) with bare-metal stent (BMS) in patients with diabetic mellitus (DM).
BACKGROUND: Despite advances in the medical treatment and revascularization procedures, coronary artery disease remains a leading cause of morbidity and mortality in patients with DM. Few retrospective subgroup analyses of pivotal clinical trials have suggested that SES may be effective for reduction of restenosis in diabetic patients. OCT is a new intravascular imaging method with a high resolution of approximately 10 micrometer and allows us to evaluate instent neointimal hyperplasia (NIH) in vivo.
METHODS and RESULTS: Serial OCT analyses were performed in 60 lesions (SES in DM patients=19; SES in non-DM patients=14; BMS in DM patients=10; BMS in non-DM patients=17) at 9-month follow-up. A total of 6920 stent struts were visualized by OCT and NIH thickness inside each strut and incidence of exposed stnet struts were evaluated in cross-sectional image. The NIH thickness was significantly different among 4 groups (97 +/− 100 vs. 43 +/− 61 vs. 425 +/− 206 vs. 209 +/− 138 micrometer, respectively). The NIH thickness of SES in DM was significantly thicker than that of SES in non-DM (p<0.001), although it was significantly thinner than that of BMS in DM (p<0.001) or BMS in non-DM (p<0.001). All struts of BMS were covered by neointima, but 14% of struts of SES were exposed. The incidence of exposed struts and exposed struts with inadequate apposition in DES were significantly lower in DM compared with those in non-DM (5% vs. 34%, p<0.0001; 2% vs. 5%, p <0.001, respectively). Moreover, the frequency of DES with partially exposed strut was significantly lower in DM than non-DM (32% vs. 71%, p<0.027).
CONCLUSION: The present OCT study revealed that DES inhibited the NIH effectively with low incidence of exposed stent strut in DM patients at 9-month after implantation.